Roseville police are asking for the public's help in finding a sixth suspect involved a home-invasion robbery and stabbing.

Alex Dorian Conwell, 21, previously lived in Indiana and in Pittsburg, California, but has been around Northern California recently and is suspected in the robbery of a home in the Highland Reserve neighborhood, Roseville police said.

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During the early morning hours of Jan. 8, several robbers broke into the home through and window and held one of the residents at gunpoint while they took a large number of firearms and other property, police said.

The investigation revealed that it wasn't a random crime, and the house was targeted for the firearms inside.

While investigating the home-invasion robbery, detectives found evidence connecting the robber with another recent crime -- a stabbing on Jan. 9 in a Roseville parking lot, according to officers.

A local man went to a parking lot on Roseville Parkway near Galleria Boulevard and got into a car with other men to sell them marijuana, police said.

During the sale, one of the drug buyers pointed a shotgun at the victim, a fight followed and the victim was stabbed several times, investigators said. The suspects pushed him out of the car and they left.

The victim was treated for multiple stab wounds at a local hospital.

Since then, police arrested five people in connection with the two incidents.